CN114279561A - Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof - Google Patents
Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof Download PDFInfo
- Publication number
- CN114279561A CN114279561A CN202111549582.5A CN202111549582A CN114279561A CN 114279561 A CN114279561 A CN 114279561A CN 202111549582 A CN202111549582 A CN 202111549582A CN 114279561 A CN114279561 A CN 114279561A
- Authority
- CN
- China
- Prior art keywords
- thz
- liquid crystal
- cholesteric liquid
- carbon
- light field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a terahertz optical field visualization analyzer, a preparation method, a test method and an analysis method thereof. The invention provides a novel THz light field visual analyzer for preparing a carbon-based terahertz metamaterial device based on a laser induction method in one step, the absorption characteristic of the carbon-based metamaterial to THz waves, the thermochromism effect of cholesteric liquid crystal capsules and the like, and the properties of THz intensity, frequency, polarization and the like are quantified through simple image analysis. The THz visual analyzer is simple to prepare and low in cost, meets the actual application requirements of portability and simplicity and convenience in operation at room temperature, and has certain potential in development and application of a THz system in the future.
Description
Technical Field
The invention relates to the field of terahertz, in particular to a terahertz light field visual analyzer.
Background
Terahertz waves (THz) generally refer to electromagnetic waves having a frequency in the range of 0.1-10THz, between microwave and infrared. Due to the unique property of the THz wave, the THz technology has great scientific value and wide application prospect in the fields of object imaging, environmental monitoring, biomedicine, high-speed space communication, national security and the like. The THz light field analyzer is used as the key of the application in the field and has very important research significance. Most of the traditional THz analyzers can only analyze one of THz optical parameters independently, integration is not realized, and the equipment is complex to manufacture, large in size and high in cost. Therefore, THz analyzers still face practical challenges of high efficiency and low cost. The metamaterial (metamaterial) comprises a metamaterial surface (metassurface) as a sub-wavelength artificial microstructure material, and the electromagnetic parameters (dielectric constant epsilon and magnetic permeability mu) can be designed in theory at will. Particularly in the THz wave band, no particularly effective material is available in nature for manipulating the THz wave, so that the metamaterial becomes an ideal platform for manipulating the THz wave. On one hand, the metamaterial can realize control on THz strength, frequency, polarization and the like in transmission; on the other hand, the metamaterial can control the near-field THz-type surface plasmons. In addition, the metamaterial device has the advantages of small volume, light weight, high efficiency and the like, can expand the functions of the traditional THz device, and becomes a research hotspot of the integration and miniaturization of the THz system. These advantages based on metamaterials make it an ideal device for analyzing THz optical fields.
Carbon is a basic element constituting various organic substances and living matters. Carbon-based materials such as graphite, graphene, and carbon nanotubes exhibit some excellent properties including high surface area, high carrier mobility, high thermal conductivity, and the like. Has wide application value in physics, chemistry and material science. In recent years, some THz metamaterial devices based on carbon-based materials such as graphite/graphene have been proposed in succession, however, the performance of these devices depends on making complex structured graphene. In 2014, Tour et al successfully prepared porous Graphene by directly performing Laser ablation on Polyimide (PI for short) by using a carbon dioxide infrared Laser system, and a product of the preparation method is called Laser Induced Graphene (LIG). The porous graphene produced by this method has a high surface area, high thermal stability, and excellent electrical conductivity. The whole processing process can be carried out in ambient air, no solvent is needed, and the cost is low. The method for ablating PI by laser avoids a complex wet chemical method, can directly prepare a patterning structure, and creates a good foundation for wider application of carbon-based metamaterial devices.
Cholesteric Liquid Crystal (CLC) is sensitive to temperature, and a change in temperature can change a pitch p of a molecular structure, and different pitches reflect light of different wavelengths, so that the CLC exhibits different colors. The Cholesteric Liquid Crystal capsule (CLCM) can protect core material Liquid Crystal, widen the application range of the Liquid Crystal material and fully exert the performance of the Liquid Crystal material. The temperature of the CLCM is increased due to THz light field radiation, the color of the CLCM is changed due to temperature change, and image characteristic information such as the color of the CLCM under different THz light fields can be acquired by using a microscopic storage device. The THz light field parameters are converted into visible light by one-to-one correspondence of the THz light field parameters and image characteristic information obtained based on a conventional optical microscopic imaging system, and the changes of the THz light field parameters can be directly observed through eyes, so that the THz light field image conversion system is convenient and practical, does not need electro-optical conversion, and is low in cost.
Disclosure of Invention
The invention aims to provide a terahertz light field visual analyzer capable of detecting the THz strength, frequency and polarization characteristics of high strength, a preparation method, a test method and an analysis method thereof, and the terahertz light field visual analyzer is stable and practical and does not need any additional component.
In order to achieve the purpose, the invention provides a terahertz optical field visual analyzer which comprises a terahertz source, a lens, an adjustable sample stage, a core device and a microscopic device, wherein the core device is placed on the adjustable sample stage and can be adjusted in position, and the terahertz source is focused on the core device through the lens.
The invention has the further improvement that the core device consists of a metal substrate layer, a carbon-based metamaterial layer and a cholesteric liquid crystal capsule; the cholesteric liquid crystal capsule is added to the carbon-based metamaterial structure layer through micro-nano operation by means of capillary fixed points.
The invention is further improved in that the microscopic device is composed of an optical microscope equipped with an industrial camera and an imaging lens and a display, and the color change condition of the cholesteric liquid crystal capsule is detected by the optical microscope and is shown by the display.
The invention is further improved in that the selected cholesteric liquid crystal capsules are micron-sized liquid crystal capsules with temperature-sensitive characteristics.
The invention has the further improvement that the simulation software is utilized to design the carbon-based metamaterial structure, and the THz light field parameters are distinguished by setting various parameters of the metamaterial structure; the carbon-based metamaterial layer is prepared by directly writing a metamaterial structure on a polyimide film by using a carbon dioxide laser with the wavelength of 10.6 mu m; the performance of the carbon-based metamaterial is adjusted by controlling various parameters of the laser.
In a further development of the invention, the core device is produced by the following steps: mixing the cholesteric liquid crystal capsule powder with methyl silicone oil to form matching fluid; and adding the cholesteric liquid crystal capsules to the carbon-based metamaterial structure layer at fixed points by micro-nano operation under the visual field of an optical microscope by virtue of the optical microscope and the capillary, and finally placing the cholesteric liquid crystal capsules on the metal substrate.
The invention is further improved in that the color change condition of the cholesteric liquid crystal capsule can be detected more accurately by adopting results obtained by a contrast transmission type detection method and a contrast reflection type detection method.
The invention also provides a preparation method of the terahertz light field visualization analyzer, which comprises the following steps:
providing a terahertz source, a lens, an adjustable sample stage and a microscope device;
providing a core device, wherein the core device is composed of a metal substrate layer, a carbon-based metamaterial layer and a cholesteric liquid crystal capsule; the cholesteric liquid crystal capsule is added to the carbon-based metamaterial structure layer through micro-nano operation by means of capillary fixed point; the carbon-based metamaterial layer is obtained in one step by directly writing a metamaterial structure on a polyimide film by using a carbon dioxide laser.
The invention also provides a test method of the terahertz light field visible analyzer, which comprises the following steps:
s1: placing the prepared core device embedded with the cholesteric liquid crystal capsule at a focus of THz radiation;
s2: controlling THz intensity with a THz wire grid; to ensure that the cholesteric liquid crystal capsules reach a stable thermal equilibrium state, the THz wire grids are rotated at time intervals of 10s, respectively;
s3: shooting sample images under different THz radiation by adopting a microscope; the microscope device has display and image storage functions, and the image information of the tested sample is obtained through the display and stored in an external storage device display to be processed.
The invention also provides an analysis method for analyzing by using the terahertz light field visual analyzer, which determines the corresponding relation between each parameter of the THz light field and the image characteristic information obtained based on the conventional optical microscopic imaging system; processing image characteristic information of the cholesteric liquid crystal capsule under different THz light fields acquired from a microscope by using image software; under different THz light field conditions, the cholesteric liquid crystal capsule can present the change of image information such as different colors and the like; the THz intensity is changed, and the detection of the THz light field intensity is realized through the change of the image information of the cholesteric liquid crystal capsule corresponding to the change of the image information of the color and the like of the cholesteric liquid crystal capsule at the same position of the same unit of the carbon-based metamaterial structure; the THz frequency is changed, and the THz light field frequency is distinguished through the change of the image information of the cholesteric liquid crystal capsule, corresponding to the change of the image information of colors and the like of the cholesteric liquid crystal capsule at different positions of the carbon-based metamaterial structure in the same unit; the THz polarization changes, and the THz light field polarization distinguishing is realized through the changes of the image information of the cholesteric liquid crystal capsule, corresponding to the changes of the image information of colors and the like of the cholesteric liquid crystal capsule at different positions of the carbon-based metamaterial structure at the same frequency.
The invention has the following beneficial effects: the invention provides a novel THz light field visual analyzer based on the thermochromism effect of CLCM and the absorption characteristic of a carbon-based metamaterial to THz waves, and the properties of THz intensity, frequency, polarization and the like are quantified through simple image analysis. The THz visual analyzer is simple to prepare and low in cost, meets the actual application requirements of portability and simplicity and convenience in operation at room temperature, and has certain potential in development and application of a THz system in the future. In addition, the method for preparing the carbon-based terahertz metamaterial device by one step through the laser induction method provides convenience for the preparation of the visual analyzer.
Drawings
FIG. 1 is a schematic diagram of a terahertz optical field visual analyzer according to the present invention
FIG. 2 is a schematic diagram of laser-induced preparation of a carbon-based metamaterial according to the present invention.
FIG. 3 is a surface topography and a Raman spectrum of the carbon-based metamaterial prepared in the invention under an electron microscope.
Fig. 4 is a frequency simulation experiment diagram of a carbon-based metamaterial structure designed in the present invention.
FIG. 5 is a polarization simulation experiment diagram of a carbon-based metamaterial structure designed in the present invention.
FIG. 6 is an experimental result diagram of a terahertz optical field visualization analyzer designed in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be emphasized that in describing the present invention, various formulas and constraints are identified with consistent labels, but the use of different labels to identify the same formula and/or constraint is not precluded and is provided for the purpose of more clearly illustrating the features of the present invention.
The invention discloses a terahertz light field visual analyzer, which comprises a carbon-based metamaterial structure prepared by laser induction and a cholesteric liquid crystal capsule which generates microscopic visible color change along with the change of a THz light field.
As shown in fig. 1, the terahertz optical field visual analyzer device of the present invention includes a terahertz source 1, a lens 2, an adjustable sample stage 3, and a sample 4. The terahertz source 1 is focused on a sample 4 through a lens 2; sample 4 is composed of a metal substrate layer 5, a polyimide film layer 6, a cholesteric liquid crystal capsule layer 7, an optical microscope 8 and a display 9.
The processing schematic diagram of the laser-induced preparation of the carbon-based metamaterial is shown in FIG. 2. The designed metamaterial structure is directly irradiated on the polyimide film by a CO2 laser with the wavelength of 10.6 mu m through computer control software to prepare the metamaterial structure. Fig. 3 shows a carbon-based metamaterial structure generated under an electron microscope and a raman spectrum thereof at room temperature, and the generated carbon-based material presents a porous structure. The carbon-based material prepared by laser induction in fig. 3 has three typical characteristic peaks: D. g and 2D peaks; the D peak (-1350 cm-1) represents the defect peak, reflecting the structural defect or edge, the G peak (-1580 cm-1) reflects its symmetry and degree of crystallinity, and the 2D peak (-2700 cm-1) D represents the vibrational mode of the two-photon lattice, which is the frequency doubling peak of the D peak.
Example 1:
the embodiment is a simulation experiment result of a designed carbon-based metamaterial structure under simulation software. The left graph in fig. 4 shows the electric field energy at 1.75THz for one unit of the designed carbon-based metamaterial structure in fig. 1. As can be seen from the electric field energy diagram, the energy applied to the same unit of the carbon-based metamaterial structure is different. The right graph in fig. 4 shows the simulated absorption experiment results, and three distinct absorption peaks exist at 1.75, 2.0 and 2.5THz respectively. In conjunction with the electric field energy diagram shown in fig. 4, the right structure of the metamaterial unit corresponds to f1 with the frequency of 1.75 THz. Similarly, the frequency 2.0THz and the frequency 2.5THz correspond to the other two structures of the metamaterial unit, respectively. Thereby, a distinct detection of the THz light field frequency can be achieved. The left diagram in fig. 5 shows that the carbon-based metamaterial structure designed in fig. 1 has different absorption characteristics in TE and TM polarization modes. The middle graph and the right graph in fig. 5 respectively show the surface electric field energy distribution of the carbon-based metamaterial structure designed under different polarization modes at the frequency of 2.5 THz. Because the metamaterial structure has polarization correlation, different energy distribution conditions can be presented at different positions under the same frequency; thereby, a differentiated detection of the THz light field polarization may be achieved.
Example 2:
in this embodiment, the relationship between the THz light field intensity and the change of image information such as the color of the CLCM is set in a steady state. To show the relationship of different THz intensities to CLCM color change, the experiment used the rotation of the THz wire grid to control the THz wave radiation intensity. CLCM has very good temperatureSensitivity, about 0.1 ℃ and thermochromic time in milliseconds. To ensure that the CLCM reaches a stable thermal equilibrium state, the THz wire grid is rotated at 10s intervals. The initial state power is 0, no THz is transmitted, and after 10s, the wire grid is rotated at a sampling interval of 0.1mW, and CLCM image data at the moment is stored. Thereafter, the rotation was continued at predetermined time intervals and sampling intervals in this order until the power was 0.6mW and the THz wave was completely transmitted. The graph (a) in fig. 6 is a CLCM image observed microscopically and taken at the same position of the same unit of the carbon-based metamaterial structure at different THz intensities: the color change of the CLCM at different THz intensities at thermal equilibrium is shown. When THz intensity increases, CLCM temperature increases, and its reflected wave shifts from long wave to short wave, and its color gradually changes from red to green. To facilitate image analysis, tone-based CLCM images are processed using image processing software. Fig. 6(b) shows the relationship between the average hue value and the THz intensity after the color-changing image is digitized under the thermal equilibrium state, wherein the ordinate is the hue mean value at the same position of the CLCM image under different THz intensities collected by taking the pixel mean value of 5 × 5 outside the center point of the CLCM by using a pipette tool, and the fitting curve as shown in fig. 6(b) is obtained by performing data fitting by a polynomial of order 2, and the abscissa shows the THz power. The fitting results report and fitting function are shown in FIG. 6, correcting the adjusted fitting degree R2The factor reaches 0.96802. The THz light field intensity is detected through the change of image information such as CLCM color.
The device and the testing method are simple, convenient and efficient, can especially detect the THz strength, frequency and polarization characteristic of high strength, and quantize the color change caused by the THz light field by utilizing the THz absorption of the carbon-based metamaterial structure and the thermochromatic effect of the CLCM. The device is stable and practical, and does not need any additional component for measurement.
In conclusion, the technical scheme provides a novel THz light field visual analyzer based on the thermochromism effect of the CLCM and the absorption characteristic of the carbon-based metamaterial on the THz wave; the properties of THz intensity, frequency and polarization were quantified by simple image analysis. The THz visual analyzer is simple to prepare and low in cost, meets the actual application requirements of portability and simplicity and convenience in operation at room temperature, and has certain potential in development and application of a THz system in the future.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a terahertz light field visual analysis appearance which characterized in that: the terahertz source is characterized by comprising a terahertz source (1), a lens (2), an adjustable sample stage (3), a core device (4) and a microscope device, wherein the core device (4) is placed on the adjustable sample stage (3) and can be adjusted in position, and the terahertz source (1) is focused on the core device (4) through the lens (2).
2. The terahertz light field visualization analyzer of claim 1, wherein: the core device (4) is composed of a metal substrate layer (5), a carbon-based metamaterial layer (6) and a cholesteric liquid crystal capsule (7); the cholesteric liquid crystal capsule (7) is added to the carbon-based metamaterial structure layer through micro-nano operation by means of capillary fixed points.
3. The terahertz light field visualization analyzer of claim 1, wherein: the microscopic device consists of an optical microscope (8) and a display (9), wherein the optical microscope (8) is provided with an industrial camera and an imaging lens, and the color change condition of the cholesteric liquid crystal capsule is detected by the optical microscope (8) and is shown by the display (9).
4. The terahertz light field visualization analyzer of claim 1, wherein: the selected cholesteric liquid crystal capsule is a micron-sized liquid crystal capsule with temperature-sensitive characteristic.
5. The terahertz light field visualization analyzer of claim 2, wherein: designing a carbon-based metamaterial structure by using simulation software, and distinguishing THz light field parameters by setting various parameters of the metamaterial structure; the carbon-based metamaterial layer (6) is prepared by directly writing a metamaterial structure on a polyimide film by using a carbon dioxide laser with the wavelength of 10.6 mu m; the performance of the carbon-based metamaterial is adjusted by controlling various parameters of the laser.
6. The terahertz light field visualization analyzer of claim 5, wherein: the core device is prepared by the following steps: mixing the cholesteric liquid crystal capsule powder with methyl silicone oil to form matching fluid; and adding the cholesteric liquid crystal capsules to the carbon-based metamaterial structure layer at fixed points by micro-nano operation under the visual field of an optical microscope by virtue of the optical microscope and the capillary, and finally placing the cholesteric liquid crystal capsules on the metal substrate.
7. The terahertz light field visualization analyzer of claim 1, wherein: the result obtained by adopting two detection methods of contrast transmission and reflection can be adopted to detect the color change condition of the cholesteric liquid crystal capsule more accurately.
8. The preparation method of the terahertz optical field visualization analyzer as claimed in any one of claims 1 to 7, wherein: the method comprises the following steps:
providing a terahertz source (1), a lens (2), an adjustable sample stage (3) and a microscope device;
providing a core device (4), wherein the core device (4) is composed of a metal substrate layer (5), a carbon-based metamaterial layer (6) and a cholesteric liquid crystal capsule (7); the cholesteric liquid crystal capsule (7) is added to the carbon-based metamaterial structure layer through micro-nano operation by means of capillary fixed point; the carbon-based metamaterial layer (6) is obtained in one step by directly writing a metamaterial structure on a polyimide film by using a carbon dioxide laser.
9. A testing method using the terahertz optical field visualization analyzer as defined in any one of claims 1 to 7, wherein: the method comprises the following steps:
s1: placing the prepared core device embedded with the cholesteric liquid crystal capsule at a focus of THz radiation;
s2: controlling THz intensity with a THz wire grid; to ensure that the cholesteric liquid crystal capsules reach a stable thermal equilibrium state, the THz wire grids are rotated at time intervals of 10s, respectively;
s3: shooting sample images under different THz radiation by adopting a microscope; the microscope device has display and image storage functions, and the image information of the tested sample is obtained through the display and stored in an external storage device display to be processed.
10. An analysis method using the terahertz light field visualization analyzer as defined in any one of claims 1 to 7, wherein: determining the corresponding relation between each parameter of the THz light field and the image characteristic information obtained based on the conventional optical microscopic imaging system; processing image characteristic information of the cholesteric liquid crystal capsule under different THz light fields acquired from a microscope by using image software; under different THz light field conditions, the cholesteric liquid crystal capsule can present the change of image information such as different colors and the like; the THz intensity is changed, and the detection of the THz light field intensity is realized through the change of the image information of the cholesteric liquid crystal capsule corresponding to the change of the image information of the color and the like of the cholesteric liquid crystal capsule at the same position of the same unit of the carbon-based metamaterial structure; the THz frequency is changed, and the THz light field frequency is distinguished through the change of the image information of the cholesteric liquid crystal capsule, corresponding to the change of the image information of colors and the like of the cholesteric liquid crystal capsule at different positions of the carbon-based metamaterial structure in the same unit; the THz polarization changes, and the THz light field polarization distinguishing is realized through the changes of the image information of the cholesteric liquid crystal capsule, corresponding to the changes of the image information of colors and the like of the cholesteric liquid crystal capsule at different positions of the carbon-based metamaterial structure at the same frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549582.5A CN114279561A (en) | 2021-12-17 | 2021-12-17 | Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549582.5A CN114279561A (en) | 2021-12-17 | 2021-12-17 | Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114279561A true CN114279561A (en) | 2022-04-05 |
Family
ID=80872817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111549582.5A Pending CN114279561A (en) | 2021-12-17 | 2021-12-17 | Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114279561A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740615A (en) * | 2022-04-11 | 2022-07-12 | 南京邮电大学 | Adjustable terahertz attenuator and preparation method thereof |
-
2021
- 2021-12-17 CN CN202111549582.5A patent/CN114279561A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740615A (en) * | 2022-04-11 | 2022-07-12 | 南京邮电大学 | Adjustable terahertz attenuator and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review | |
| Holloway et al. | Atom-based RF electric field metrology: from self-calibrated measurements to subwavelength and near-field imaging | |
| CN109238505B (en) | High-sensitivity high-resolution contact type three-dimensional temperature field imaging system and method | |
| CN103134779B (en) | Spectroscopic method and device for quickly testing type II infrared superlattice interface quality | |
| CN107219002B (en) | A kind of ultrahigh resolution spectral measurement method and system | |
| CN103584834A (en) | Reverse focusing microscopic imaging structure and method | |
| CN114279561A (en) | Terahertz light field visualization analyzer and preparation method, test method and analysis method thereof | |
| CN103018217A (en) | Non-linear optical test system under out-field induction | |
| Batignani et al. | Broadband impulsive stimulated Raman scattering based on a chirped detection | |
| Zhang et al. | 3D small-field surface imaging based on microscopic fringe projection profilometry: a review | |
| CN103364973A (en) | Soft terahertz wave modulator | |
| Zain et al. | ZnO nanorods coated microfiber loop resonator for relative humidity sensing | |
| CN111551516B (en) | Efficient visual terahertz detector and preparation and test methods thereof | |
| CN111880072A (en) | Method for characterizing 4H-SiC electrical properties by Raman spectrum based on photon-generated carrier effect | |
| CN105738301A (en) | High-diffraction-intensity two-dimensional colloidal crystal-gold array/intelligent hydrogel composite material and visual sensor | |
| CN105136299A (en) | Novel infrared spectrum inversion method based on PEM and device thereof | |
| Zhang et al. | Polarization-independent multi-resonance with high Q-factor for highly sensitive terahertz sensors based on all-dielectric metasurface | |
| CN109632095B (en) | Visual terahertz power meter based on cholesteric liquid crystal and testing method thereof | |
| Shoute et al. | Solvent effects on resonant first hyperpolarizabilities and Raman and hyper-Raman spectra of DANS and a water-soluble analog | |
| Ma et al. | Real-time imaging of electromagnetic fields | |
| Li et al. | Simultaneous measurements of refractive index and temperature based on a no-core fiber coated with Ag and PDMS films | |
| CN107340611B (en) | The light-operated terahertz wave modulator of silicon substrate PVA film of laser heat treatment | |
| Zhang et al. | Study of vehicle exhaust detection based on TDLAS | |
| Wang et al. | High-speed and dynamic measurement of the diffraction efficiency of a grating in a wide wavelength range | |
| Wang et al. | Numerical research on supercavity sensing driven by guided resonance in a terahertz all-metal metamaterial absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |